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Cisco 2851 configuration for a single T1 on a dual port WIC - config review

Posted on 2007-12-01
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Last Modified: 2008-02-01
Noob on Cisco routers.  I have a new Cisco 2851 router with dual port WIC in slot 0.  This is for a single T1 internet connection.  Verizon tech did the config for the router.  I'm not able to access the internet and have pull the config.  I don't see the WAN ip configured on the serial interface... i think that is the problem.  Below is the config of the router:  Does the config look right?  Am I correct in that the WAN ip is needed on serial interface to route outbound traffic to Verizon?  If so, what and how to make changes to make this work?

hostname u123456

no service udp-small-servers

no service tcp-small-servers

!

ip subnet-zero

ip routing

no ip http server

!

enable-password ******

!

controller T1 0/0/0

framing esf

linecode b8zs

channel-group 0 timeslots 1-24 speed 64
 

interface GigabitEthernet0/0

ip address 65.215.x.x 255.255.255.248

duplex auto

speed auto

!

interface Serial 0/0/0:0

description to UUNET u123456

no ip address

no ip redirects

no ip proxy-arp

encapsulation frame-relay IETF

no ip mroute-cache

no fair-queue

frame-relay lmi-type ansi

!

interface Serial 0/0/0:0.1 point-to-point

ip unnumbered GigabitEthernet0/0

no arp frame-relay

frame-relay interface-dlci 500 IETF

!

ip classless

ip route 0.0.0.0 0.0.0.0 Serial0/0/0:0.1

!

ip domain-name ALTER.NET

ip name-server 198.6.100.38

!

line con 0

login

password ******

transport preferred none

!

line aux 0

login

password ******

modem InOut

transport preferred none

transport input all

transport output all

stopbits 1

rxspeed 9600

txspeed 9600

flowcontrol hardware

!

line vty 0 4

login

password ******

transport preferred none

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Question by:99YammieR1
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by:bfason
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config on the router looks ok depending on what you are using for internal Ip addresses. Do you have another device doing Nat?
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by:99YammieR1
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bfason, i have a pix firewall sitting behind the router that does nat.  i don't need nat on the router.  why isn't the wan ip i got from the isp not configured on the serial interface?
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bfason earned 500 total points
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The sub-interface of S0/0/0.1 is the one communicating with your provider. The command "Ip unnumbered G0/0" tells it use the ip address of the gigabit interface. This saves internet routable IP addresses. So your pix's outside interface will need an address in the same subnet as the g0/0 interface on router.

Hope this helps
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by:99YammieR1
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bfason, definitely helps.  after talking to the verizon tech, i did get the cpe wan ip from him.  this ip is on a 255.255.255.252 subnet and is not part of the block of lan ip i got.  the g0/0 lan ip is not the same scheme as the wan serial ip.  if i replace "ip unnumbered g0/0" with ip x.x.x.x 255.255.255.252 (the router wan ip i got from verizon) for s0/0/0.1 then it'll be able to talk to the isp side.
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by:bfason
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Great, let us know how it works out for you.
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by:99YammieR1
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I changed the ip on serial0/0/0:0.1 from "ip unnumbered g0/0" to "ip x.x.x.x 255.255.255.252" but still no go.  I can see the lan side of the router.
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by:bfason
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From the router can you ping the isp gateway?

Another thing is the gateway of last resort. I would change it from ip route 0.0.0.0 0.0.0.0 s0/0/0.1 to ip route 0.0.0.0 0.0.0.0 xxx.xxx.xxx.xxx
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by:99YammieR1
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no i cannot ping the isp gateway (the router wan ip i've assigned to s0/0/0.1)
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by:bfason
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Is the gateway address and the given S0/0/0.1 address in the same subnet?

When you do a "show ip int brief" is s0/0/0.1 up and up?

If so do a "show frame pvc" and see if the pvc is active.
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by:99YammieR1
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Verizon address and CPE address are on the same subnet, 255.255.255.252.

GigabitEthernet0/0         65.215.53.xxx   YES NVRAM  up                    up

GigabitEthernet0/1         unassigned      YES NVRAM  administratively down down

Serial0/0/0:0              unassigned      YES NVRAM  up                    down

Serial0/0/0:0.1            63.111.121.xxx  YES NVRAM  down    

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by:bfason
bfason earned 500 total points
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Looks like your frame circuit isn't up.

Do a show frame lmi and look for Num status enq sent and recieved to determine if LMI is up.
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by:99YammieR1
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yep, circuit wasn't up.  it's resolved now.  thanks for all your help.  greatly appreicate it.
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